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If you did not measure wear etc to specs on the rocker assemblies you may have excess wear there. As for the ping, did you rebuild the heads and get a valve spring in wrong, not properly seated or etc??? Are the pushrod ends all in good condition etc.??

Beings you DIDN'T give a YEAR (so I don't know if it's a carb or injection), I can only give generalizations.

Pinging in internal combustion engines occurs when air/fuel mixture in the cylinder has been ignited by the spark plug and the smooth burning is interrupted by the unburned mixture in the combustion chamber exploding before the flame front can reach it. The engineered combusting process ceases, because of the explosion, before the optimum moment for the four-stroke cycle. The resulting shockwave reverberates in the combustion chamber, creating a characteristic metallic "pinging" sound, and pressures increase catastrophically.

Some of the possible causes:

The hotter your engine is, the more likely your engine is to ping. The farther your timing is advanced, the more likely your engine is to ping. The higher your compression ratio is, the more likely your engine is to ping. The lower the octane of gas you use, the more likely your engine is to ping.

As far as the whining noise, does it sound like a chain noise?
Again, the causes/fix depend on what YEAR your bike is.

Gas pouring out is an overflow. The only reason there would be an overflow is when the float activated valve does not close the fuel inlet port. This could be caused by dirt, sand, rust or any foreign material. Fix would call for a carb pulldown, soaking non-rubber parts, and cleaning.

The 1100 Custom requires the valves to be adjusted every 3000 miles.It is best to use high octane gas also. Regular or shall I say CHEAP gas will over time cause the pinging or spark knock.

Pinging could also be something worse if it does not go away with valve adjustment and better gas. Get it checked right away.Kinda miss my ole 1100 custom but the Yamaha Raider I have now does not require valve adjustments every 3,000 miles. And fast.... oh dear lord. :)